Walthers 910-46521 HO Scale 50' AAR Single Door Boxcar Northern Pacific NP 1130 Mold Making 50 inches tall with a

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Walthers 910-46521 HO Scale 50' AAR Single Door Boxcar Northern Pacific NP 1130 Mold Making 50 inches tall with aWalthers 910 46521 HO Scale 50' AAR Single Door Boxcar Northern Pacific NP 1130 The Association of American Railroads had been trying to set design standards for freight cars starting in the early 20th century. The early designs were not widely embraced. Many railroads preferred their own designs. By the time the 1937 AAR boxcar was introduced, this had begun to change as each new design standard provided higher capacity, lighter, more durable cars.